IPv4 Allocation stats

We're not ARIN members so I can't post to arin-discuss - thought someone here might be able to help me out.... Can anyone explain to me why the ARIN IPv4 Issued statistics, e.g. http://www.arin.net/statistics/index.html#ipv4issued2003, do not seem to match up with the stats available from ftp://ftp.arin.net/pub/stats/arin/arin.20030601? For example, if you add all the allocations and assignments listed in arin.20030601 for April 2003 you get 819,456. Dividing by 256 to get /24 equivalents gives 3,201. But http://www.arin.net/statistics/index.html#ipv4issued2003 states 7,056 /24 equivalents were issued in April 2003. I'm sure there's a simple explanation. So what is it? Maybe I can't do arithmetic... -- Mat